CN1019956C

CN1019956C - Improved scarfing nozzle

Info

Publication number: CN1019956C
Application number: CN87106926A
Authority: CN
Inventors: 罗纳德·埃尔默·弗尔霍普; 雷蒙德·约翰·马卡拉
Original assignee: Isaiah Aktibrag
Current assignee: Isaiah Aktibrag
Priority date: 1986-10-22
Filing date: 1987-10-08
Publication date: 1993-03-03
Anticipated expiration: 2002-10-08
Also published as: AU7999487A; ES2025166B3; US4765597A; JPH0325688B2; KR880004890A; KR920003020B1; EP0268350B1; BR8705517A; JPS643408A; DE3773339D1; CN87106926A; EP0268350A1; CA1323828C; ZA877279B; ATE67705T1; AU602730B2

Abstract

Apparatus for scarfing defects in a metal workpiece having an oxygen discharge nozzle terminating in a nozzle discharge orifice adapted to discharge a sheet-like stream of cutting oxygen of uniform intensity across the surface of a metal workpiece and means for admixing a gas with the oxygen to be discharged through the discharge orifice wherein at least one edge of the sheet-like stream of oxygen is of reduced privity insufficient to scarf a workpiece, while the remainder of the sheet-like stream is sufficient to scarf defects from a workpiece surface.

Description

Improved scarfing nozzle

The present invention relates to the heat chemistry top layer cleaning of defective metal works, be commonly referred to scarfing, specifically, be meant a kind of nozzle that is adapted at removing blemish on the whole work-piece or is suitable for the non-trimming scarfing of various different cross section sizes.

Known from institute, when steel are produced, all to clear up the surface of steel usually in the interstage of steel processing.The purpose of this cleaning is in order to remove such as defectives such as crackle, seam and slag inclusions, otherwise can stay defective in finished product.Remove one with thermochemical method with suitable machine, or polylith, or the surface layer on part surface, can remove this class defective from workpiece economically, the biography that this machine preferably is installed between the roll stand frame passes on the device.Like this, the steel workpiece can be hot and do not interrupt clearing up under the quantity-produced condition.

Under many circumstances, rolling mill is not only produced a kind of workpiece of size, but usually produces the workpiece of multiple different size, and changing workpiece size on some milling train is frequent thing.Past is when Surface Flaw such as removal blank, ingot bar, steel ingot, steel plate, use has the scarfing machine of single-nozzle, this nozzle sprays one Oxygen Flow, acutangulate the whole steel surface of ground directive, produce thermal chemical reaction with surface metal, the multiply Oxygen Flow of perhaps utilizing many nozzles in a row or that embark on journey to spray.

Recently, people attempt to adopt a kind of method of energy-conservation, high yield, are called hot base method or direct rolling, the semi-finished product steel from continuous casting or slab production process with the hot processing station of directly delivering to.If removing in this stage, breach, slag inclusion and other defective then on finished product, just may not develop into nonvolatil defective.

Such just as has been noted, this class defective usually utilizes the scafing method on whole surface to remove, but this will cause the loss of a large amount of metals, thereby often use the partial flame removing surface method (being commonly referred to local, point-like or banded scarfing) of removing defective partly instead.In order to overcome above-mentioned shortcoming, in the part or the metal surface scafing method of point-like, developed the kinds of processes method and apparatus.For example aspect the partial flame removing surface, use several independent scarfing nozzles usually, start selectively, make it only clear up the part that blemish is arranged, and do not clear up the whole work-piece surface across the adjacent arrangement of metal works mobile route.

The nozzle of traditional scarfing process using has many kinds.That the most frequently used oxygen spray hole shape has is circular (shown in 2,309, No. 096 United States Patent (USP) of Buckman etc.), or nose circle slot-shaped (as 2 of Babcouk etc., shown in 664, No. 368 United States Patent (USP)s), or continuous slot-shaped (2 of Moe-singer, 622, No. 048 United States Patent (USP) and Allmang etc. 2,838, No. 431 and 3, shown in 231, No. 431 United States Patent (USP)s).Along the edge or the border of cut-back region, slag and defective material (comprising molten metal) flow out and are piled into thin layer or film from cleaning when adopting such scarfing technology.The part of these thin layers or film is bonded on the metal surface, is bonded at cleaning place edge usually, is called " overlap ".This slag is not iron oxide entirely, also contains a large amount of metallic irons, and these metallic irons are owing to the hot outflow of melting is given birth in reaction.This overlap is harmful especially, forms blemish because it can enter workpiece in the operation of rolling subsequently, so wish it is reduced to a minimum, preferably thoroughly eliminates, to prevent producing defective on the finished product.

Usually reducing the method that overlap forms is, uses the nozzle of the above-mentioned type, combines with the jet of air, water or similar substance, sprays to the overlap that begins to form, and makes on its surface of the work that never needs scafing before uncured to remove.

Recently, the point type scarfing nozzle can be cleared up the defective of distribution at random on the metalwork in a ground, and can not form overlap on the cleaning segment boundary.For example 4,013 of Engel, No. 486 and 4,040, No. 871 United States Patent (USP)s just relate to the geometry that changes the scarfing nozzle slit, to reduce the oxygen flow that flows out from nozzle edge.As 4,040, pointed out a kind of single scarfing nozzle in No. 871 United States Patent (USP)s, yet, the cleaning face width degree of Chan Shenging is narrower than the spray-hole of nozzle like this, so two such nozzles and arranging device can form two adjacent cleaning faces, and one will not stayed between two cleaning faces by zone scarfing or the scafing deficiency.4,013, the nozzle that No. 486 disclosed nozzles of United States Patent (USP) have been eliminated this and arranging device basically between cut-back region not by the zone of scafing or scafing deficiency, but it just reaches this purpose with the method for the geometry that changes the nozzle slit, the flexibility that this has used when just having reduced under different scarfing conditions with automation.

A kind of point type scarfing machine has been realized commercial applications, can carry out the surface stripping layer of whole work-piece or with the defective of scafing distribution at random.This machine is made up of many or the two or more adjacent scarfing nozzles of a row, and each nozzle wherein and other nozzle are immediate side by side.A kind of startup method of the general employing of such machine can make scarfing be reflected at along starting on any point on the steel Workpiece length.In such machine, what wish most is when the defective width that needs cleaning equals or is longer than the width of nozzle clearing, finish remove between the adjacent clearing zone not by scafing or the not enough zone of cleaning, simultaneously can also be with can automation, preferably the scafing equipment of remote control is finished non-trimming scarfing.

Known from institute, among many variablees and condition to the influential necessity of scarfing reaction (removing the heat chemistry exothermic reaction of metal surface), oxygen purity must be controlled at certain level in the cutting fluid.The oxygen purity of the Oxygen Flow of scarfing nozzle just can be controlled the amount of metal that scarfing reaction can make removal and reduce to zero like this.Multiple solution route has been proposed so far, normally utilize this factor as one in many factors of the scarfing layer that produces non-trimming, comprise it being to utilize various auxiliary scarfing device and nozzle forms, can be used to distribute other non-trimming scafing method of low-purity oxygen or oxygen-free gas to generally include to adopt outside jet being located on or near scarfing nozzle edge, nozzles etc. distribute air or water or other fluid, and the steel of the fusing at its clearing zone edge is blown off.Therefore speed, power and the momentum of this fluid are exactly the principal element of removing overlap.

The method that also has other generation non-trimming scarfing district, its principle are to reduce oxygen flow.A kind of typical application is as 4,013, and No. 486 United States Patent (USP) is disclosed like that, promptly changes the geometry of scarfing nozzle, reducing the jet expansion of standard, thereby reduces oxygen flow.Other scheme comprises the nozzle that adopts standard geometrical shapes, but falls low oxygen pressure.No matter under that a kind of situation, oxygen flow all will be reduced to a certain degree, make it be not enough to keep the scarfing reaction, thereby do not produce overlap at scarfing area edge place.

A kind of scarfing spray nozzle device is disclosed among the clear 54-10255 of Japan Patent, form by the nozzle between manifold type device, head device, upper and lower, the pre-warmware and oxygen channel and nonflame cleaning gas passage, wherein nonflame cleaning gas is spurted into the passage that is positioned at air chest, enter nozzle passage then, pre-warmware is positioned at the both sides of the nozzle passage in air chest downstream.The gas that is used for scarfing then enters nozzle passage by the passage in the air chest.The defective of this layout is that the width that is used for the Oxygen Flow of scarfing will not have the width of nozzle passage so wide, bring harmful effect for like this jeting effect of the nozzle assembled unit of installing side by side when cutting off the supply of nonflame cleaning gas.

Though have many known technologies and equipment to drop into commercial the application, they all have certain shortcoming, for example: the nozzle of special shape and injector are too complicated; To handling the composition of steel, pressure of the temperature of scarfing speed, steel, the flow of oxygen or the like variable lacks flexibility; Technology or equipment is to limitation of automation or the like, and what wish most is to have developed big flexibility, and the system selected of automation or remote control easily is if particularly this improvement can reduction equipment and the complexity and the price of system.

An object of the present invention is to provide a kind of scarfing nozzle, this nozzle can process the clearing zone of non-trimming, clearing zone is basically as nozzle width itself, or can use the defective of scafing arbitrary dimension and position on the metal surface partly, and do not form overlap.

Another object of the present invention provides a kind of partial flame removing surface nozzle, and this nozzle can process the non-trimming clearing zone of arbitrary dimension or position, and the automatic control of suitable scarfing.

The 3rd purpose of the present invention provides a kind of partial flame nozzle clearing of not variable cross-section, and this nozzle can process the same with nozzle itself basically wide non-trimming clearing zone.

The 4th purpose of the present invention provides a kind of scarfing nozzle that can process the non-trimming clearing zone, can change the scafing operating mode by the purity that changes the Oxygen Flow that ejects from the corresponding edge in nozzle slit, thereby produce the scarfing district of non-trimming at an easy rate.

The 5th purpose of the present invention provides a kind of scarfing nozzle that can process the non-trimming clearing zone, by nozzle on one side or both sides with a kind of gas and oxygen mix, to be reduced in this or the oxygen purity on both sides on one side.

The 6th purpose of the present invention provides a kind of partial flame removing surface nozzle, this nozzle can be identical with other nozzle side by side, with the form work of row or row,, and between nozzle, can not form underproof ridge or ditch with the generation scarfing district wideer than single-nozzle.

Other purpose of the present invention can and be got in touch corresponding accompanying drawing by following detailed description and be obtained understanding.

The oxygen jet of scarfing metallic object defective of avoiding forming overlap according to the present invention is by manifold type device, head device, on, nozzle between the pre-warmware and oxygen channel and nonflame cleaning gas passage is formed down, it is characterized in that: on described, down an end of pre-warmware is connected on the manifold type device of the oxygen that is used to receive and allot scarfing and nonflame cleaning gas and the head device and extends out from it, thereby last, define a nozzle passage and a spray-hole that is positioned at the other end between the pre-warmware down with continuous slit-type of preset width, be used in described nozzle passage, receiving the oxygen that scarfing is used from described manifold type device and head device, and penetrate from the shape Oxygen Flow from described spray-hole, its width equals the width of nozzle passage at least; Described nonflame cleaning gas channel means is extended from described manifold type and head device, pass, in the following pre-warmware at least one, be used for optionally receiving nonflame cleaning gas through the location from described manifold type and head device, and optionally nonflame is cleared up gas and inject and describedly the lower surface of pre-warmware and spray in the nozzle passage between the upper surface of pre-warmware and along the edge of nozzle passage down, so that from the removing surface of spray-hole ejaculation of flame with Oxygen Flow before, described scarfing gas and nonflame cleaning gas is selectively mixed in the marginal portion of the sheet Oxygen Flow that penetrates from spray-hole, make the marginal portion oxygen purity of the sheet air-flow that ejects drop to the scafing work that is not enough to, thereby prevent to generate overlap, and the width in control scarfing district in the cleaning marginal zone; Situation about whether using side by side with other spray nozzle device according to the required width in scarfing district and described spray nozzle device with the joining control device of described nonflame cleaning gas passage, be used for controlling selectively nonflame cleaning gas flow or by flowing to the one or both sides of described nozzle passage, so that make the size in scarfing district be less than or equal to this nozzle width.

In above-mentioned nozzle of the present invention, formed nozzle passage also can comprise unlimited lateral edge portions between the upper and lower pre-warmware, and its structure helps installing and produce a continuous scarfing district side by side and making the width dimensions of clearing zone be substantially equal to the overall width of the built up nozzle unit of installation side by side of nozzle.

Can be mounted to the built up nozzle unit side by side by many above-mentioned nozzles of the present invention, the oxygen purity of the gas of the continuous sheet air-flow marginal portion of its injection is reduced to and is not enough to carry out scafing work, thereby makes the size in scarfing district be less than or equal to the overall width of built up nozzle unit.

Apparatus and method of the present invention will be very clear in below with reference to the description of the drawings, and these accompanying drawings are the explanations to the embodiment of the invention, but be not any limitation of the invention.

Fig. 1 is according to the side view that the single scarfing device of a scarfing nozzle is housed of the present invention;

Fig. 2, the perspective view of single scarfing device shown in Figure 1;

Fig. 3, the partial side view of a scarfing nozzle of the scarfing device of Fig. 1;

Fig. 4, the top perspective view of the nozzle of Fig. 1;

Fig. 5 A, 5B and 5C are according to the side view of other embodiment of scarfing nozzle of the present invention;

Fig. 6 is according to the perspective view of three scarfing devices that have into the row nozzle of layout in a row of the present invention;

Fig. 7 A, demonstration fluid rate among the embodiment and oxygen purity figure;

Fig. 7 B, among the embodiment from the typical cross-sectional view of metal works surface removal metal.

The participate-reform accompanying drawing, identical number is represented same part, and at Fig. 1, the scarfing device is represented with 10 usually in 2,3, and scarfing nozzle of the present invention is installed in this device.This scarfing device 10 comprises that is gone up a pre-warmware 12, and it has a common last preheating mouth 12A; Pre-warmware 14 under one, it has a common following preheating mouth 14A; 16, one common manifold type devices 17 of a common head and a common guide plate 18.Upward the upper surface 13 of the lower surface 11 of pre-warmware 12 and following pre-warmware 14 defines the scarfing nozzle 15 of a continuous slit-type, and this nozzle has a spray-hole 20, by sheet Oxygen Flow " V " that scarfing is used of this hole ejection.Oxygen or oxygen and combustion gas are fed to manifold 17 through the pipe (not shown), utilize well known mode to lead to scarfing nozzle 15 then and lead to preheating spout 12A and 14A.

In whole specifications and spray-hole one speech of speaking of in the claim represent rectangle plane, its width (Fig. 4) is determined by the border " u " of scarfing device, highly is definite with the limit 20B of following pre-warmware 14 by the limit 20A of last pre-warmware 12.The side in nozzle 15 and hole 20 can be sealed or (best) opened, as shown in Figures 1 to 3.

For the distance that is maintained fixed between scarfing nozzle and surface of the work when the scarfing, the guide plate 18 of common scarfing device is bearing on the surface of workpiece " W ".When at workpiece " W ", when for example relative motion taking place between a plate slab and the scarfing device 10, this scarfing reaction is to strike with acute angle in the molten bath of surface of the work by the sheet scafing Oxygen Flow " V " by 20 ejections of nozzle ejection hole to carry out.

According to the present invention, manifold type device 17 is connecting feed tube 22 and the 22A that has control valve 24 and 24A.Such supply pipe 22 is connected with 26A with path 26 respectively with 22A, by manifold 17.16 and last pre-warmware 12 and

outlet

28 and 28A in last pre-warmware 12, a kind of diluent gas and oxygen mix, then by continuous slot type scarfing nozzle 15.Usually before spray-hole 20 jet-stream winds, in previously selected position, dilute oxygen stream is along an edge or two opposed edges ejections of Oxygen Flow.

When one less than the nozzle border " u " among the 15(Fig. 4 of nozzle slot type hole) when the Oxygen Flow of width will be used for this scarfing reaction, feed tube 22A between two supply pipes 22 and passage 26A and outlet 28A are communicated with, are used for supplying diluent gas and oxygen mix along the Oxygen Flow edge that reduces width according to the present invention.

Fig. 4 shows at Fig. 1, the position of the underside perspective view of the last pre-warmware 12 of the scarfing device in 2 and 3 and its outlet 28 and 28A.Should go up the width of pre-warmware 12 and use " u " expression usually,

outlet

28 and 28A arrange across the Oxygen Flow direction by nozzle bore 15.The distance that exports the leading edge 20A of 28 supreme preheatings 12 is " S ", and the distance of supreme pre-warmware 12 lateral edge is " T ".Outlet 28A between these two outlets 28, usually along the center line of last pre-warmware 12, to leading edge 20A distance be " S ".Then according to the present invention, outlet 28 on the lower surface 11 of last pre-warmware 20 and the position of 28A can change, promptly 28 with 28A in each the distance " S " can be different or identical, the outlet 28 each the distance " T " also can be identical or different; Usually outlet 28A is positioned at the centre of two outlets 28.

Accompanying drawing shows feed tube 22 and 22A is connected on passage 26 and the 26A at three places, so that diluent gas is fed in the pre-warmware 12, other provides the device of mist also to be suitable for forward direction at the oxygen of scarfing nozzle slit 15 edges by spray-hole 20 ejections at gas.For example, only use two supply pipes 22; Perhaps as shown in Fig. 5 A,

passage

26 and 26A can be by pre-warmwares 14 down; Perhaps as Fig. 5 B illustrated,

passage

26 and 26A can lead to many outlets that are arranged in

rows

28 and 28A then by last pre-warmware 12; Perhaps as shown in Fig. 5 C, supply pipe 22 and 22A can directly be communicated with passage 26 and the 26A in the pre-warmware 12.More commonly, the device of supplying with diluent gas can be provided with like this, the gas that makes selected or variable quantity in the border of scarfing nozzle slit 15 with the oxygen mix that is positioned at the edge of sheet Oxygen Flow, the position of mixing in nozzle slot 15 can change because of the width in the non-trimming scarfing district that requires.As at Fig. 1,3 and 5A to 5C shown in like that, the diluent gas spray angle that is ejected into the sheet Oxygen Flow on the border that is arranged in nozzle slot 15 is represented (Fig. 3) with " G ".Angle " G " is 60 ° (Fig. 3), though this angle can change to about 170 ° scope at about 5 °, the optimum range of using angle " G " usually is about 30 ° to about 80 °.

This nozzle passage 15 is the shape of slit in constant cross section, can spray the sheet Oxygen Flow of uniform strength on across the surface of the work of (Fig. 4) of being equivalent to nozzle 15 width " u ".According to the present invention, the Oxygen Flow of injection is mixed with a kind of gas at the opposite edges place of nozzle bore 20, and the amount of gas can reduce oxygen purity, makes it be not enough on border, scarfing district keep in addition the scarfing reaction.The border width in this scarfing district is equivalent to the width in hole 20 usually, perhaps less than the width in hole 20.The gaseous mixture intensity speed of spraying at the lateral edge place of nozzle bore 20 is preferably identical with speed from the sheet air-flow of the pure oxygen (or claiming to cut oxygen) of nozzle bore 20 ejections, although may slightly increase in air-flow edge intensity.In any case, the speed of mixture of oxygen by provide remove slag and not the momentum of iron oxide be that the result of acquisition non-trimming has made important contribution.

It in Fig. 6 a kind of scheme that scarfing device 10 is installed side by side.Flow is unrestricted between the edge of scarfing device, and like this, on the width in many nozzle ejection hole 20 of crossing whole row's scarfing device, the intensity of injection of oxygen stream is identical basically.When the oxygen that mixes with diluent gas not during by this scarfing device, can produce the scarfing district that a basically full degree of depth identical with multiinjector device width removed, increased the metal surface width that one stroke may be cleared up simultaneously, comprised whole work-piece stripping layer.Yet, when adopting an arranging device to carry out point-like scarfing, in order to guarantee maximum flexibility, promptly in order to carry out local point-like scarfing to the defective of wide variety on the whole work-piece surface at one stroke, each single nozzle ratio should be equipped with diluent gas feedway of the present invention.Like this, these nozzles just can be according to the width of defective for clearance as single scarfing nozzle, or device in a row uses.According to the present invention, according to the nominal width of the Breadth Maximum and the single scarfing device of workpiece, can be with two or more, even nearly 11 scarfing devices are installed side by side.

A kind of structure of Fig. 1-3, can make scarfing device 10 produce the same with nozzle basically wide non-trimming scarfing district, perhaps produce the scarfing district of local point-like non-trimming, when the scarfing device contacts with workpiece " W ", and when reaching the leading edge that comprises the zone of waiting to remove defective, this installs startup, the most handy quick start method, as 3,991,985 and 3,966, No. 503 United States Patent (USP) is disclosed like that, and will be adjusted to the required intensity of scarfing by the oxygen flow of nozzle bore 20.Diluting gas flow by last pre-warmware 12 should be adjusted to the degree that is enough to sheet air-flow oxygen purity at least on one side is reduced to the scarfing district that can obtain non-trimming.

According to the present invention, be applicable to oxygen mix can be any fluid or gas beyond the deoxygenation with the diluent gas that reduces the oxygen purity from nozzle bore, spray or fluid, this fluid or gas can not carry out chemical reaction and produce iron oxide in normal scarfing reaction, as air, nitrogen, water, combustion gas or their mixture.These diluent gas or fluid are ejected at least one edge of Oxygen Flow, and preferably the one or more points along these Oxygen Flow opposite edges spray, and carry out mixing of physics with the Oxygen Flow in nozzle slot 15.

For the expert is clearly, will can pass through any other known physical method in the diluent gas passage oxygen, for example inhalation etc.In addition, it all is possible can finally causing on any other sections of nozzle slit 15 ejection sheet Oxygen Flow diluent gas being mixed into Oxygen Flow in nozzle or in the oxygen channel of scarfing device.

In the incipient stage of scarfing process, a molten bath forms on surface of the work, a control is adjusted to the intensity of scarfing by the valving (not shown) of the oxygen flow of nozzle bore 20, the valving (24) that control diluent gas enters the flow of scarfing device 10 is adjusted to and can obtains diluting the amount of oxygen demand at the edge of air-flow, and can not influence the intermediate width that is used for the scarfing pure oxygen.When scarfing device 10 by workpiece, when perhaps workpiece is advanced with respect to the scarfing device, on surface of the work, promptly produce a scarfing district, be non-trimming along the boundary in scarfing district.Scarfing device 10 will work on, and the rear end that reaches this defect area up to it stops just now.

Contain along at least one edge of Oxygen Flow and reduced the dilution oxygen of purity from the scarfing Oxygen Flow of nozzle perforation 20 ejection, make it can prevent that the scarfing district from making nozzle width equally wide.An important characteristic of the present invention is to control the amount of diluent gas, for example, by increasing or reduce fluid pressure, obtaining the best combination of overlap controlled condition under the extremity of scarfing, or make the scarfing sector width maximum or less than the width of spray nozzle device.The selection of the carrier gas scale of construction can be by control realization automatically, and like this, the size in non-trimming scarfing district also can be determined automatically.In addition, as discussed above the characteristics of these nozzles of the present invention comprise that nozzle does not block, and automatic control ability is arranged like that, and this is particularly advantageous for becoming arranging device to use.

The operation that another favourable characteristics of the present invention are scarfing devices can be created in the scarfing district of non-trimming on the edge.Because on another edge, there is not dilution, so can produce full degree of depth scarfing district than broad.In addition, this scarfing device can form overlap or a series of overlap, thus to whole work-piece stripping layer, particularly clearing zone seldom the time efficient higher.

The flow and the pressure of the chemical composition that typical scarfing state parameter is the steel workpiece, workpieces surface condition, scarfing speed, scarfing oxygen, and the temperature of steel, in addition, in making, scarfing device itself also relates to the countless versions combination of parameter.Like this, keeping the oxygen purity scope of scarfing reaction and the carrier gas scale of construction of the scarfing Oxygen Flow edge that can not keep the scarfing reaction changes some.In a word, the oxygen purity that requires according to scarfing of the present invention reaction is 99.5% or higher, and scarfing Oxygen Flow edge be that oxygen purity is diluted between 85% to 98%, even lower again be suitable.

Wonderful and the beyond thought advantage that obtains according to the present invention can be showed by following embodiment.

With reference to Fig. 4 and Fig. 5 c, the point type scarfing device of a standard has the slit-type nozzle (device width u) of wide 210mm, and hole (26) is improved by being 6mm at last pre-warmware 12 by two diameters of brill.Each edge 15mm(T of pre-warmware on the pitch-row) (Fig. 4), the leading edge 20A 50mm(S of pre-warmware 12 on the distance).The flow velocity 14SCMH(of air 0 ℃, 760mm HgF standard cubic meter/hour) enter the scarfing air-flow from outlet (28) ejection, this air-flow 20 is discharged from the hole with 1050SCMH.Air (diluted fluid) becomes the passage 26 of 60 ° (G) through two and enters the slit-type nozzle 15 intramarginal scarfing Oxygen Flow that are positioned at scarfing device 10.

This scarfing device 10 is approximately 20 ℃ mild steel workpiece with 9 meters/minute of scarfing speed with respect to temperature and advances.

Various experimental results are seen Fig. 7 A, remove the cross-sectional view of metal and see Fig. 7 B.

In Fig. 7 A and Fig. 7 B, provided according to general parameter of the present invention.The region representation that indicates " 30 " and " 31 " the scarfing reaction here reduces gradually and stops, and at scarfing area edge place non-trimming.The zone that indicates " 32 " points out to carry out the scarfing reaction here, and obtains the removal metal of the full degree of depth.Suppose all other parameter constants, the scarfing reaction is untenable under certain oxygen purity.This scarfing district stops at a C and D place, and non-trimming, yet the Oxygen Flow speed in the slit remains unchanged beyond C and D point after the nozzle ejection substantially.There is shown a kind of typical cross section of removing metal from steel surface, E is the width of the full degree of depth R of removal metal name in scarfing district, and F is the overall width in scarfing district.The full degree of depth of this name is removed width E and is adapted with zone 32 usually, and its width is 150mm and the overall width F in scarfing district between C and D point is 200mm; Metal removal rate R is 4mm.Reduce gradually in

zone

30 and 31 scarfings reaction like this, and stop at a C and D place.Scarfing does not take place in the zone beyond a C and D.Yet, beyond a C and D the approximate maintenance of this fluid velocity identical with zone 32, be reduced to zero then gradually.This speed state can be by blowing the effect that slag charge and unoxidized steel reach non-trimming off.

Claims

1, a kind of oxygen jet of avoiding forming the scarfing metallic object defective of overlap, by manifold type device, head device, on, nozzle between the pre-warmware and oxygen channel and nonflame cleaning gas passage is formed down, it is characterized in that: on described, down an end of pre-warmware is connected on the oxygen that is used to receive and allot scarfing and nonflame cleaning gas manifold type device and the head device and extends out from it, thereby last, define a nozzle passage and a spray-hole that is positioned at the other end between the pre-warmware down with continuous slit-type of preset width, be used in described nozzle passage, receiving the oxygen that scarfing is used from described manifold type device and head device, and from described spray-hole ejaculation sheet Oxygen Flow, its width equals the width of nozzle passage at least; Described nonflame cleaning gas channel means is extended from described manifold type and head device, pass, in the following pre-warmware at least one, be used for optionally receiving nonflame cleaning gas through the location from described manifold and head device, and optionally nonflame is cleared up gas and inject and describedly the lower surface of pre-warmware and spray in the nozzle passage between the upper surface of pre-warmware and along the edge of nozzle passage down, so that from the removing surface of spray-hole ejaculation of flame with Oxygen Flow before, described scarfing gas and nonflame cleaning gas is selectively mixed in the marginal portion of the sheet Oxygen Flow that penetrates from spray-hole, make the marginal portion oxygen purity of the sheet air-flow that ejects drop to the scafing work that is not enough to, thereby prevent to generate overlap, and the width in control scarfing district in the cleaning marginal zone; Situation about whether using side by side with other spray nozzle device according to the required width in scarfing district and described spray nozzle device with the joining control device of described nonflame cleaning gas passage, be used for controlling selectively nonflame cleaning gas flow or by flowing to the one or both sides of described nozzle passage, so that make the size in scarfing district be less than or equal to this nozzle width.

2, nozzle according to claim 1, it is characterized in that, formed nozzle passage further comprises unlimited lateral edge portions between the upper and lower pre-warmware, to help installing and produce a continuous scarfing district side by side and making the width dimensions of clearing zone be substantially equal to the overall width of the built up nozzle unit of installation side by side of nozzle.

3, a kind of combination oxygen jet unit of avoiding forming the scarfing metallic object defective of overlap, it is characterized in that this combination oxygen jet is by installing side by side according to the described nozzle of claim 2, so that make the width dimensions that produces continuous scarfing district be substantially equal to the overall width of the combination oxygen jet unit of installing side by side.